/usr/lib/ghc-doc/hoogle/wai-logger-prefork.txt is in libghc-wai-logger-prefork-doc 0.3.0-2build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-wai-logger-prefork-doc/html/wai-logger-prefork.txt